SYNOPSIS

DESCRIPTION

The insmntque() function associates a vnode with a mount. This includes
updating v_mount for the vnode, and inserting the vnode into the mount’s
vnode list.
The mount reference count is incremented for each vnode added to the
mount, and that reference is decremented by vgone(9).
The mount’s interlock is held while the vnode is inserted. For MP-safe
file systems, the vnode must be exclusively locked.
On failure, insmntque() calls vgone(9) on the supplied vnode, and then
drops the vnode lock and reference. If more elaborated cleanup after
insmntque() failure is needed, the insmntque1() function may be used
instead. The dtr argument is a pointer to a function that is called on
failure. This function may perform any custom cleanup. The vnode
pointer is supplied as the first argument to dtr. The dtr_arg argument
is the second, supplying any additional context needed.

RETURNVALUES

The insmntque() function will always return 0, unless the file system is
currently being unmounted in which case it may return EBUSY. Also,
insmntque() may be forced to insert the vnode into the mount’s vnode list
by setting the VV_FORCEINSMQ flag in the vnode v_flag, even if the file
system is being unmounted.